Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f51ae1470b9afe4…

MALICIOUS

PDF

64.0 KB Created: 2021-09-22 23:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25d420f3570a0e76ae9b8f5fbc6c5364 SHA-1: df2c0dcb965d2474503ad8b8dfce062f32ace591 SHA-256: 1f51ae1470b9afe41b1121b021cabcc400a0b97a6c47404181cea0ae9d59ada0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files, indicating a link farm or redirection mechanism. The ML classifier also identified it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7151

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://felixefontesadvogados.com.br/ckfinder/userfiles/files/tixojapaxekanerivon.pdf In PDF document text
    • https://podgoricki-klub.me/userfiles/file/nagesuzajeduj.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/fizekopijevajor.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/lokovino.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/66125133083.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/30846055389.pdfIn PDF document text
    • http://skene.es/userfiles/file/92018712617.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/0e239c7098d0051caf7ba312f5c7256c/26990505038.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/boved.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/57798235992.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/sewelafa.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/78784281931.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/lujuxavopanitekugojeno.pdfIn PDF document text
    • http://creationart.hu/files/file/79776337081.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/karevikomoxomux.pdfIn PDF document text
    • https://bfull.ru/uploads/files/zajume.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/82976800516.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133638c6663b---61165748028.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/18848930685.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/dasarunafile.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/59229994194.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/giwogoxiziw.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/gurog.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/613cefefdd1fc.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/71943190861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=gta+5+verify+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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